diff --git a/Library/Homebrew/test/rubocops/cask/url_legacy_comma_separators_spec.rb b/Library/Homebrew/test/rubocops/cask/url_legacy_comma_separators_spec.rb
new file mode 100644
index 0000000000..8a4606f1a5
--- /dev/null
+++ b/Library/Homebrew/test/rubocops/cask/url_legacy_comma_separators_spec.rb
@@ -0,0 +1,103 @@
+# typed: false
+# frozen_string_literal: true
+
+require "rubocops/rubocop-cask"
+require "test/rubocops/cask/shared_examples/cask_cop"
+
+describe RuboCop::Cop::Cask::UrlLegacyCommaSeparators do
+  include CaskCop
+
+  subject(:cop) { described_class.new }
+
+  context "when url version interpolation does not include version.before_comma or version.after_comma" do
+    let(:source) do
+      <<-CASK.undent
+        cask 'foo' do
+          version '1.1'
+          url 'https://foo.brew.sh/foo-#{version}.dmg'
+        end
+      CASK
+    end
+
+    include_examples "does not report any offenses"
+  end
+
+  context "when the url uses csv" do
+    let(:source) do
+      <<-CASK.undent
+        cask 'foo' do
+          version '1.1,111'
+          url 'https://foo.brew.sh/foo-#{version.csv.first}.dmg'
+        end
+      CASK
+    end
+
+    include_examples "does not report any offenses"
+  end
+
+  context "when the url uses version.before_comma" do
+    let(:source) do
+      <<-CASK.undent
+        cask 'foo' do
+          version '1.1,111'
+          url 'https://foo.brew.sh/foo-#{version.before_comma}.dmg'
+        end
+      CASK
+    end
+    let(:correct_source) do
+      <<-CASK.undent
+        cask 'foo' do
+          version '1.1,111'
+          url 'https://foo.brew.sh/foo-#{version.csv.first}.dmg'
+        end
+      CASK
+    end
+    let(:expected_offenses) do
+      [{
+        message:  "'https://foo.brew.sh/foo-#{version.before_comma}.dmg' should use "\
+                  "#{version.csv.first} instead of #{version.before_comma}.'",
+        severity: :convention,
+        line:     2,
+        column:   11,
+        source:   "'https://foo.brew.sh/foo-#{version.before_comma}.dmg'",
+      }]
+    end
+
+    include_examples "reports offenses"
+
+    include_examples "autocorrects source"
+  end
+
+  context "when the url uses version.after_comma" do
+    let(:source) do
+      <<-CASK.undent
+        cask 'foo' do
+          version '1.1,111'
+          url 'https://foo.brew.sh/foo-#{version.after_comma}.dmg'
+        end
+      CASK
+    end
+    let(:correct_source) do
+      <<-CASK.undent
+        cask 'foo' do
+          version '1.1,111'
+          url 'https://foo.brew.sh/foo-#{version.csv.second}.dmg'
+        end
+      CASK
+    end
+    let(:expected_offenses) do
+      [{
+        message:  "'https://foo.brew.sh/foo-#{version.after_comma}.dmg' should use "\
+                  "#{version.csv.second} instead of #{version.after_comma}.'",
+        severity: :convention,
+        line:     2,
+        column:   11,
+        source:   "'https://foo.brew.sh/foo-#{version.after_comma}.dmg'",
+      }]
+    end
+
+    include_examples "reports offenses"
+
+    include_examples "autocorrects source"
+  end
+end